crypto/perlasm/x86nasm.pl

   1 #!/usr/local/bin/perl
   2
   3 package x86nasm;
   4
   5 $label="L000";
   6
   7 %lb=(   'eax',  'al',
   8         'ebx',  'bl',
   9         'ecx',  'cl',
  10         'edx',  'dl',
  11         'ax',   'al',
  12         'bx',   'bl',
  13         'cx',   'cl',
  14         'dx',   'dl',
  15         );
  16
  17 %hb=(   'eax',  'ah',
  18         'ebx',  'bh',
  19         'ecx',  'ch',
  20         'edx',  'dh',
  21         'ax',   'ah',
  22         'bx',   'bh',
  23         'cx',   'ch',
  24         'dx',   'dh',
  25         );
  26
  27 sub main'asm_init_output { @out=(); }
  28 sub main'asm_get_output { return(@out); }
  29 sub main'get_labels { return(@labels); }
  30
  31 sub main'external_label
  32 {
  33         push(@labels,@_);
  34         foreach (@_) {
  35                 push(@out, "extern\t_$_\n");
  36         }
  37 }
  38
  39 sub main'LB
  40         {
  41         (defined($lb{$_[0]})) || die "$_[0] does not have a 'low byte'\n";
  42         return($lb{$_[0]});
  43         }
  44
  45 sub main'HB
  46         {
  47         (defined($hb{$_[0]})) || die "$_[0] does not have a 'high byte'\n";
  48         return($hb{$_[0]});
  49         }
  50
  51 sub main'BP
  52         {
  53         &get_mem("BYTE",@_);
  54         }
  55
  56 sub main'DWP
  57         {
  58         &get_mem("DWORD",@_);
  59         }
  60
  61 sub main'BC
  62         {
  63         return "BYTE @_";
  64         }
  65
  66 sub main'DWC
  67         {
  68         return "DWORD @_";
  69         }
  70
  71 sub main'stack_push
  72         {
  73         my($num)=@_;
  74         $stack+=$num*4;
  75         &main'sub("esp",$num*4);
  76         }
  77
  78 sub main'stack_pop
  79         {
  80         my($num)=@_;
  81         $stack-=$num*4;
  82         &main'add("esp",$num*4);
  83         }
  84
  85 sub get_mem
  86         {
  87         my($size,$addr,$reg1,$reg2,$idx)=@_;
  88         my($t,$post);
  89         my($ret)="[";
  90         $addr =~ s/^\s+//;
  91         if ($addr =~ /^(.+)\+(.+)$/)
  92                 {
  93                 $reg2=&conv($1);
  94                 $addr="_$2";
  95                 }
  96         elsif ($addr =~ /^[_a-zA-Z]/)
  97                 {
  98                 $addr="_$addr";
  99                 }
 100
 101         if ($addr =~ /^.+\-.+$/) { $addr="($addr)"; }
 102
 103         $reg1="$regs{$reg1}" if defined($regs{$reg1});
 104         $reg2="$regs{$reg2}" if defined($regs{$reg2});
 105         if (($addr ne "") && ($addr ne 0))
 106                 {
 107                 if ($addr !~ /^-/)
 108                         { $ret.="${addr}+"; }
 109                 else    { $post=$addr; }
 110                 }
 111         if ($reg2 ne "")
 112                 {
 113                 $t="";
 114                 $t="*$idx" if ($idx != 0);
 115                 $reg1="+".$reg1 if ("$reg1$post" ne "");
 116                 $ret.="$reg2$t$reg1$post]";
 117                 }
 118         else
 119                 {
 120                 $ret.="$reg1$post]"
 121                 }
 122         $ret =~ s/\+\]/]/; # in case $addr was the only argument
 123         return($ret);
 124         }
 125
 126 sub main'mov    { &out2("mov",@_); }
 127 sub main'movb   { &out2("mov",@_); }
 128 sub main'and    { &out2("and",@_); }
 129 sub main'or     { &out2("or",@_); }
 130 sub main'shl    { &out2("shl",@_); }
 131 sub main'shr    { &out2("shr",@_); }
 132 sub main'xor    { &out2("xor",@_); }
 133 sub main'xorb   { &out2("xor",@_); }
 134 sub main'add    { &out2("add",@_); }
 135 sub main'adc    { &out2("adc",@_); }
 136 sub main'sub    { &out2("sub",@_); }
 137 sub main'rotl   { &out2("rol",@_); }
 138 sub main'rotr   { &out2("ror",@_); }
 139 sub main'exch   { &out2("xchg",@_); }
 140 sub main'cmp    { &out2("cmp",@_); }
 141 sub main'lea    { &out2("lea",@_); }
 142 sub main'mul    { &out1("mul",@_); }
 143 sub main'div    { &out1("div",@_); }
 144 sub main'dec    { &out1("dec",@_); }
 145 sub main'inc    { &out1("inc",@_); }
 146 sub main'jmp    { &out1("jmp",@_); }
 147 sub main'jmp_ptr { &out1p("jmp",@_); }
 148
 149 # This is a bit of a kludge: declare all branches as NEAR.
 150 sub main'je     { &out1("je NEAR",@_); }
 151 sub main'jle    { &out1("jle NEAR",@_); }
 152 sub main'jz     { &out1("jz NEAR",@_); }
 153 sub main'jge    { &out1("jge NEAR",@_); }
 154 sub main'jl     { &out1("jl NEAR",@_); }
 155 sub main'jb     { &out1("jb NEAR",@_); }
 156 sub main'jc     { &out1("jc NEAR",@_); }
 157 sub main'jnc    { &out1("jnc NEAR",@_); }
 158 sub main'jnz    { &out1("jnz NEAR",@_); }
 159 sub main'jne    { &out1("jne NEAR",@_); }
 160 sub main'jno    { &out1("jno NEAR",@_); }
 161
 162 sub main'push   { &out1("push",@_); $stack+=4; }
 163 sub main'pop    { &out1("pop",@_); $stack-=4; }
 164 sub main'bswap  { &out1("bswap",@_); &using486(); }
 165 sub main'not    { &out1("not",@_); }
 166 sub main'call   { &out1("call",($_[0]=~/^\.L/?'':'_').$_[0]); }
 167 sub main'ret    { &out0("ret"); }
 168 sub main'nop    { &out0("nop"); }
 169
 170 sub out2
 171         {
 172         my($name,$p1,$p2)=@_;
 173         my($l,$t);
 174
 175         push(@out,"\t$name\t");
 176         $t=&conv($p1).",";
 177         $l=length($t);
 178         push(@out,$t);
 179         $l=4-($l+9)/8;
 180         push(@out,"\t" x $l);
 181         push(@out,&conv($p2));
 182         push(@out,"\n");
 183         }
 184
 185 sub out0
 186         {
 187         my($name)=@_;
 188
 189         push(@out,"\t$name\n");
 190         }
 191
 192 sub out1
 193         {
 194         my($name,$p1)=@_;
 195         my($l,$t);
 196         push(@out,"\t$name\t".&conv($p1)."\n");
 197         }
 198
 199 sub conv
 200         {
 201         my($p)=@_;
 202         $p =~ s/0x([0-9A-Fa-f]+)/0$1h/;
 203         return $p;
 204         }
 205
 206 sub using486
 207         {
 208         return if $using486;
 209         $using486++;
 210         grep(s/\.386/\.486/,@out);
 211         }
 212
 213 sub main'file
 214         {
 215         push(@out, "segment .text use32\n");
 216         }
 217
 218 sub main'function_begin
 219         {
 220         my($func,$extra)=@_;
 221
 222         push(@labels,$func);
 223         my($tmp)=<<"EOF";
 224 global  _$func
 225 _$func:
 226         push    ebp
 227         push    ebx
 228         push    esi
 229         push    edi
 230 EOF
 231         push(@out,$tmp);
 232         $stack=20;
 233         }
 234
 235 sub main'function_begin_B
 236         {
 237         my($func,$extra)=@_;
 238         my($tmp)=<<"EOF";
 239 global  _$func
 240 _$func:
 241 EOF
 242         push(@out,$tmp);
 243         $stack=4;
 244         }
 245
 246 sub main'function_end
 247         {
 248         my($func)=@_;
 249
 250         my($tmp)=<<"EOF";
 251         pop     edi
 252         pop     esi
 253         pop     ebx
 254         pop     ebp
 255         ret
 256 EOF
 257         push(@out,$tmp);
 258         $stack=0;
 259         %label=();
 260         }
 261
 262 sub main'function_end_B
 263         {
 264         $stack=0;
 265         %label=();
 266         }
 267
 268 sub main'function_end_A
 269         {
 270         my($func)=@_;
 271
 272         my($tmp)=<<"EOF";
 273         pop     edi
 274         pop     esi
 275         pop     ebx
 276         pop     ebp
 277         ret
 278 EOF
 279         push(@out,$tmp);
 280         }
 281
 282 sub main'file_end
 283         {
 284         }
 285
 286 sub main'wparam
 287         {
 288         my($num)=@_;
 289
 290         return(&main'DWP($stack+$num*4,"esp","",0));
 291         }
 292
 293 sub main'swtmp
 294         {
 295         return(&main'DWP($_[0]*4,"esp","",0));
 296         }
 297
 298 # Should use swtmp, which is above esp.  Linix can trash the stack above esp
 299 #sub main'wtmp
 300 #       {
 301 #       my($num)=@_;
 302 #
 303 #       return(&main'DWP(-(($num+1)*4),"esp","",0));
 304 #       }
 305
 306 sub main'comment
 307         {
 308         foreach (@_)
 309                 {
 310                 push(@out,"\t; $_\n");
 311                 }
 312         }
 313
 314 sub main'label
 315         {
 316         if (!defined($label{$_[0]}))
 317                 {
 318                 $label{$_[0]}=".${label}${_[0]}";
 319                 $label++;
 320                 }
 321         return($label{$_[0]});
 322         }
 323
 324 sub main'set_label
 325         {
 326         if (!defined($label{$_[0]}))
 327                 {
 328                 $label{$_[0]}=".${label}${_[0]}";
 329                 $label++;
 330                 }
 331         push(@out,"$label{$_[0]}:\n");
 332         }
 333
 334 sub main'data_word
 335         {
 336         push(@out,"\tDD\t$_[0]\n");
 337         }
 338
 339 sub out1p
 340         {
 341         my($name,$p1)=@_;
 342         my($l,$t);
 343
 344         push(@out,"\t$name\t ".&conv($p1)."\n");
 345         }
 346
 347 sub main'blindpop { &out1("pop",@_); }